To become a Good Presenter is not easy but not so difficult.The first task is to keep your mind cool and relax.You cant be so much tensed .You have to deal with patience.Think that everything is comfortable and friendly.Before starting your speech, you have to seek attention of the audience with your cleverly thinking.If the audience get bored ,all of your efforts will be failed.You can seek their attention by asking random question among them and make them free to talk.Let them co-operate with you.If you have presentation slide,you should not go through that slide by reading them.Better ,you can show the slide and speak with them freely with your own language. Make the speech more interesting with some funny jokes.But handle the jokes in professional and classy way.Don't make it as a lame joke .If you can connect with the audience in a proper way and if they can understand why you are here to talk about,you will become successful surely.But the most promising part is , you have to believe in yourself. Your self belief can change your motivation.
And this is how i think in a positive way.Hope it can help you guys :)